that guy isn't on flats, looks like he's rocking Crank Brothers Mallet DH clipless pedals.
for flats, 5.10s are the only shoe worth wearing for DH IMO. and the finer the pins on the pedal, the better your foot sticks. pedals with allen key grub screws suck balls IMO, as the thick pins don't bite nearly as well as finer pins. if you try a pedal like HT AE03s, which have much finer pins, you'll never go back to a pedal with allen key grubs.